Fluid pressure cylinder



May 30,1939. AV 2,160,565

4 FLUID PRESSURE CYLINDER Filed Oc t. 2, 1955 s Sheets-Sheet 1 FROM BRAKE VALVE May 30, 1939.

5 Sheets-Sheet 2 Filed 0012-. 2. 1935 A 20 equivalent operatively cylinder casins.

Patented May30, 1939 UNITED-STATES PATENT orrics -2;160,565 I t room ranssuar: crumma meneiesuio, min, Italy' Application October In Great Britain 'z claims. d pressure cylin- "I'his invention relates to fl ders for actuating brakes or other devices and has for its object to provide animproved brake cylinder device of the kind adapted to be oper- 5 ated by a reduction of the value or the pressure or vacuum obtaining in one chamber or the cylinder device with respect-to the value of the pressure or vacuum normally ch in this chamber and substan y constantly obtaining in another chamber of the cylinder device.

As usually constructed a brake cylinder device of the kind referred to comprises a single movable .abutment having the two chambers arranged one on each side of the abutment, the 5 latter being operatively connected to the brake or other device to be operated, and as will be evinormally contain fluid at a pressure greater or less than atmos eric pressure, the rod or its connecting the abutment to the brake or other device must be provided gland or its equivalent where it passes through the cylinder wall.

device, the two abutments being arranged to be operatlvely connected at their other sides which 30 are exposed to atmospheric pressure to the brake or other device to be operated.

In order that the invention understood several embodiments thereof will now be described by way" of example, with reference pressure brake bers are coaxial and the hermetically 40 cylinder casin Figure'2 isa similar view mm 1 but illustrating the parts in the application position, the position as shown'in Figur ngure3isasectionalviewoiafurtherembodiment of the invention in which the two chambers are arranged side byvside in a common Figui'eLisasectionalviwoiasfllliurther 50 embodiment of theinvention in which the two chambers are arranged'eoaxially in separate cylinder casin andd are sectional views of still in!- on this rod which dent, inasmuch as both of these chambers must the non-return valve 5 maintains the dia hers i2 and maybereadily 'to move to the'right, as'shown in by'rodsloandll point therein in a "structionalem 2. ma Serial No. 43,218 Oct ber 15, 1934 able abutments consist of flexible diaphragms l and 2 located coaxially in the casing 3 or the cylinder device, a web 4 of the casing dividing the space between these-two flexible diaphragms into two chambers 5 and 6. The chamber 5 is 5 connected through a passage I directly to the brake pipe and the chamber 6; is connected through a passage 9 to a reservoir III in communication with the brake pipe 8 through a nonreturn valve II. The flexible diaphragms l and 2 are operatively connected to the brake or other device to be operated by members l2 and I3 abutting against the diaphragm, the two members l2 and It being operatively connected to one another by a rod ll and adapted to slide extends throu pertu' es in casing l ofthe cylinder device. Assuming that the cylinder isto be operated by fluid under pressure, fluid under pressure is normally suppliedto the brake it flows directly to the chamber 5 and through II to the reservoir II and chamber t. .-A spring lilocated in the chamber l and 2 and memfixed I! applied position in which, for instance, the released. When fluid under pressu e is vented from the brake pipe automatically or imder the control of a driver's brake valve device the pressure, obtalning in the chamber 5 is' reduced whilst thatobtaining in the reservoir II and the chamber constant owing to the turn valve II with the acting on the diatwo diaphras s I and 2 l2 and I2 appliedthereto F gur and brakes. are

0 remains substantially provision of the nonresult that the fluid two 'members apply the brakes.

In-a modified form of in Figure 3 the two abutments I and 2 are located in the casing 2 o! the brake cylinder deviceside by side, that is to say with vtheir axes not coaxial but parallel to one another, these di'apnragms l and 2 being operatively connected to the brake or other device to be operated through the intermediary of ioflower plates It and I! carried to the oppos te ends ot a lever 20 pivotally' mounted at central bracket member 2! carried by the casing 3, springs 22 and .23 being associated with the dlaphragm to hold the latter in their non-operative positions. In this conpipe 8 whence 2o thereto in the left-hand 2s the invention illustrated ent of the invention the two- 5 one side 24 thereof.

'oi follower plates l6 and I! to rods l8 and is connectedfby a member 21. adapted 'to cooperatewith a'lever 20 connected to the 'brake or other device this em odiment a to be operated. I The'operation of the latter-two embodiments ll scription hereinbefore of the operation of the of the invention will be understood from the deflrst embodiment of the invention.

Referring now to Figure 5, the diaphragms'in of the invention abut against an intermediate member 29- having-lugs '30 extending through slots 3| in the casing-3 of the device and carrying rods l4 extending. through apertures in the casing 3--and 'connected to a across-head 32 adapted to be connected to. the brake or otherdevice toibe operated. Figure 6 illustrates an embodiment of the invention simiclaimas new and desire to secure by Letters lar to that illustrated in Figure 5. but-as shown in Figure 6 the reservoir II is formed integrally with the casing 3 of the device.

It will be understood that the invention is not limited to the particular construction and 'arrangement oi the partsher'einbetore described which may bevaried as desired to suit particular. requirements without exceeding the scope ofthe invention.

Having now described my invention,-' what I ment in each chamber chambers with fluid 1. A fluid pressure cylinder for-actuating a, brake or other-device comprising a solid-wall dividing said cylinder into a pair of chambers of substantially equal volume, a movable abutwith the wall, the limits of said chamber, said abutments being of equal area and'subjected onone side to atmospheric pressure. and on the other side to the pressure in said chamber, means for operatively connecting said abutments on the defining, in conjunction sides exposed to atmospheric pressure to the device to be actuated,

therein and said wall, means for charsingboth' under'pressure tolth'e same degree, and means exhausting one of said chambers while retaining the other charged for 'eflect- 'ing combined movement of said abutments and device to be actuated,

2. A fluid pressure actuator comprising a housing having a solid wall dividing the same into a resilient means in one of i said chambers interposed between the abutment pair of chambers-of substantially. equal volume,"

a pressure-responsive member in each chamber} said members being of stantly subjecting one bers'to atmospheric pressure, means for connect-c said members together and to a-devi ce'to be actuated, means for supplying said chambers with fluid under pr I ure', resilient means in one chamber and' idi between saidwall and the memberi therein rl normally maintaining the connected iiiiembc ersin inoperative pomtion; and] means for exhausting fluid pressure Iromsaidlast named'chamber while retaining the other chamber chargedwithfluidpressure ior'eiiectjug-combined movement 0! said connected=mem bers and device to beitctuated."

equal area, means for con- 1 sideol each of said mem-- panorama savior t 

